GIS classes for providing an interface to GEOS-C system

This will add new functionality to the API. No impact on existing ISIS programs.

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Description

We can use the GEOS library to create singleton GisGeometry and GisTopology objects from WKB and WKT formatted gis specifications. We will also be able to write the geometry/topology to WKB or WKT.
A GisBlob class will also be added for storing footprint polygons.